Stone-saw blade.



No. 804,246. PATENTED NOV. 14, 1905. C. L. MIEL. STONE SAW BLADE.

APPLICATION FILED APR. 24, 19054 11, n u 9 u u hm 0 Jul I u ml gull" Wi l" 4 a/ a 1 h ,a'mwe/vvlioz CHARLES LHM/tL UNITED STATES PATENT OFITIOE.

CHARLES L. MIEL, OF SACRAMENTO, CALIFORNIA, ASSIGNOR TO THE UNITED STATES STONE SAW COMPANY, OF TUCSON, ARIZONA TER- RITORY, A CORPORATION OF ARIZONA TERRITORY.

STONE-SAW BLADE.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application filed April 24, 1905. Serial No. 257,259.

To all whom it may concern.-

Be it known thatI, CHARLES L. MIEL, a citizen of the United States, residing at Sacramento, Sacramento county, California, have invented certain new and useful Improvements in Stone-Saw Blades, of which the following is a full, clear, and exact description.

My invention relates to improvements in stone-saws, and particularly to bladestherefor. In constructions of this character a series of vertical blades are mounted in a longitudinal beam. Abrasive material, such as shot, &c., is spread upon the rock which it is desired to cut and the saw drawn back and forth. Pressure being applied to the sawbeam, the abrasive material is forced against the rock by the blades and a cut thus produced. These blades are usually made of steel and hardened to give greater rigidity and life.

My object is to increase the cutting capacity of the saw, while maintaining its rigidity and a suflicient degree of practical wearing qualities.

For this purpose I provide the saw-blades of steel which is hardened. The lower endor bearing end of the blade then has the temper drawn so as to present a somewhat softer edge for coaction with the abrasive material. This serves to carry the abrasive material much more effectively, and thus produces a quicker and more accurate cut in the rock.

The drawing represents diagrammatically a saw-beam with blades operating to press the abrasive material into a rock, a out being partially formed.

1 represents the rock.

2 is the abrasive material.

3 is the saw-beam, adapted for longitudinal movement and provided with suitable means for lifting the same.

4 is the saw-blade, as it is termed, which applies the necessary bearing pressure to the abrasive material for the purpose of cutting. This blade is formed of suitable plate-steel of dimensions to'correspond with the character of the work which it is desired to perform. The blade is hardened and then has the temper drawn at the lower edge 4 to a suflicient extent to produce a softer bearing edge for coaction with the abrasive material, but without materially affecting the rigidity and strength of the upper portion of the blade- While the softened edge serves to effect a quicker cutting, the body of the blade is not weakened sufliciently to permit bending or buckling.

What I claim is In a stone-saw, a blade formed of hardened steel and having a straight bearing edge for coaction with the abrasive material, the temper of the steel being drawn adjacent to said edge and producing a softer bearing-surface, for the purpose specified.

CHARLES L. MIEL.

Witnesses:

L. VREELAND, RoB'r. S. ALLYN. 

